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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1a10cd76ed4ecd4b01a0829da8f79ffcf5c6ad967592f42ce2769a6b37cde1' 
  AND token = '/XDolNLaGCbBg0jTtArmzTlD3G5PWGAhitT26LD7pdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}